How's this for a Fear Factor? The new NBC reality series Love Shack has singles moving in together before the first date. Here's the sitch: A man and woman "shack up" in a Southern Calif. mansion to date — and ditch — their various houseguests. (Kinky!) At the end of six episodes, the winning couple gets a one-year lease on the posh digs. Shack debuts Aug. 26.